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(No Model.) 2 Sheets-Sheet 1v J. & H. KNEOHT. MACHINE FOR SHARPENINGSAWS.

No. 433,866. Patented Aug.5, 1890.

W'Ltn 6556.5. [53 I III 67 1 3 2 Sheets-Sheet 2.

(N0 Modl.) J. 8: H. KNECHT.

MACHINE FOR SHARPENING SAWS.

No. 433,866. Patented Aug. 5, 1890.

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(Z, v l MAMA/LA KM" K JM 4W mus versus 20., mm-D-umm, msnmeron n cUNITED STATES PATENT OEEIcE.

JACOB KNECI-II AND HEINRICH KNECHT, OF ZURICH, SWITZERLAND.

MACHINE FOR SHARPENING SAWS.

SPECIFICATION forming part of Letters Patent No. 433,866, dated August5, 1890. v Application filed February 8, 1890- Serial No. 339,730. (Nomodel.) Patented in Switzerland May 29, 1889, No. 1,( )72.

To all whom it may concern:

Be it known that we, JACOB KNECHT and HEINRICH KNECHT, citizens ofSwitzerland, residing at Zurich,in the canton of Zurich and Republic ofSwitzerland, have invented certain new and useful Improvements inMachines for Sharpening the Teeth of Endless Saws, and Frame andCircular Saws, (for which we have obtained Letters Patent inSwitzerland, No. 1,072, dated May 29, 1889;) and we do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

This invention pertains to a certain new and improved saw-sharpeningmachine; and it comprises the detail, construction, combination, andarrangement of parts, substantially as hereinafter fully set forth, andparticularly pointed out in the claims. The sharpening goes on with thegreatest correctness, the saw sets in by itself by means of a simplepressure upon a lever, and the pitch as Well as the height of the teethof very old saws may be restored. The machine Works with great ease andis very easy to attend to.

The annexed drawings represent, in Figure 1 a front view; Fig. 2, an endview of the said machine; Figs. 3 and 3, some parts of the clampingarrangement; Figs. 4 and 4, the clamping apparatus for the endless saws;Figs. 5 and 5, the same apparatus for circular-saws.

To the upper end of a standard y is secured an arm a, to which a platecl is connected. Upon this latter plate (1 is a second plate (1, movablyfixed by means of screws 01 which also su ort a uidin -frame d whereinmoves a slide (1 capable of being moved up by a screw-spindle (Z havinga hand-wheel d". Two collars Z Z of the slide cl" form bearingsforashaft Z which on one end is provided with a grooved pulley Z and onthe other a grinding or sharpening wheel Z.

On the standard there is a plate 6, upon which another plate e,connected with aheadstock a, is fixed by the screws 6 To this head stocka is secured (or formed therewith) a guiding-frame 6 upon which a slidee Is attached in such a manner that It may be moved to and fro by meansof a joint-lever v 2. The set-screws h and h limit the movement of theslide a in opposite direction. To the slide a is secured a rotaryguidingframe 6, fixed thereon by the screws c and c In this frame e isdisposed a slide capable of being moved down and upward by a lever 1 andbar 6 The set-screws h and 71 are also here intended to limit the strokeof the slide.

Upon the slide 6 a plate 70 is pivoted at k and is fixed thereon bymeans of the screw 70*. The upper edge of this plate 70, supporting thedifferent frames into which the saw-blades are put, must be brought intoa horizontal position before the machine is operated. At the upper endof the plate 70 slides a knee 0. The joint-lever 3 effects, when presseddown, a movement of this knee 0 from the right to the left, and thespringfdraws back the knee 0 and the lever 3 into the first positionwhen loosened.

In the upper end of the knee 0, provided with a slit, a slide-rest o isarranged movable to the right and the left. A catch 0 with a setscrew 0is fixed upon this slide-rest 0 The slide d" supports an adjustablefence' d against which runs the screw 0, screwed in the bearer 0 Thesaw-blade is pressed into the frame o by means of a knee ki'beari-ng afiat spring. A bar 0" is fitted to join the frame r with the plate is.

Two screw-clamps o and v joined together by a bar r and movable upon thebar 7 are intended to fix the saw-blade s. The bar T has two angles rand r laid over the upper edge of the saw-blade. Thebasis g supports thedifferent frames mentioned above.

For holding fast an endless-saw blade We apply a wooden two-part frameu,-Figs. 4 and 4, in which the said blade can slide. Bythe screw it thesaw-blade can be put into its correct height. The hinge-joints a and aallow knee 'w, movable in the horizontal direction, the longest leg ofwhich is provided with a groove. The screw-bolt 10 put into this groove,forms the center of the blade. The grinding-wheel Z receives its rotarymovement from the communicator b and the grooved pulleys b and Z Beforethe machine is to be started the following operations must be proceededwith: The saw-blade to be sharpened is fixed upon the frame r by meansof the screw-clampso and Q72, whereby the angles 0 and r of the bar rlie upon the teeth of the blade. Then must be adjusted, first, theguiding-frame (2 with its slide a in such a manner that the center ofthe latter forms a parallel to the back of the tooth, the lifting of theslidec being limited by the set-screws h and 71,2, second, theguiding-frame c with its slide 6 in such a manner that the center of thelatter forms a parallel to the face of the tooth with the set-screws 7L3and h. After having given the desired position to the grindingwheel Z,we make the distance between the adjustable fence d and the screw 0level to the pitch of the teeth, and the machine is ready for use. Forworking the face (cutting part) of the toot-h the lever 1, with the bar6 is lifted, whereby the slide c is moved upward till this movement isstopped by the lower set-screw. During this operation the Whole frame islifted parallel to the face of the teeth, and simultaneously one toothis prepared by the grinding-wheel. An oppositedirection of the lever 1rcconducts the slide a into its original position, also limited by aset-screw. To the working of the back of the tooth the lever 2 is moved,acting on the slide e in a similar manner as it has been describedabove. The lever 3 when pressed down moves the bar r with the saw-blades to the left by means of the parts 0 0 0 till the screw 0 runs againstthe adjustable fence cl". The spring f draws back the parts .9 r 0 0 0as soon as the lever 3 is released, and the proceedingis repeated. Theblades of the endless and circular saws are worked in a similar manneras we have described above.

WVe claim- 1. In a saw-sharpening machine, the combination, with thesaw-support, of a stationary frame 6 an adjustable slide 6 located insaid frame, and a lever connected to said slide for operating the same,substantially as set forth.

2. In a saw-sharpening machine, the combination, with the saw-support,of a-stationary frame 6?, an adjustable slide 6, located in said frame,set-screws h kg, for. limiting the movement of said slide, and a leverconnected to said slide, substantially as set forth.

3. In a saw-sharpening machine, the combination, with the saw-support,of a stationary frame 6 an adj ust-able slide 6 located in said frame,and the lever for operating said slide, substantially as set forth.

at. In a saw-sharpening machine, the combination, with the saw-support,of the stationary frame a, the slide 6 the frame 6 the slide 0 theconnection between said frame 6 and slide 6 and the operating-levers,substantially as set forth.

5. In a saW-shar enin machine the com bination,with the saw-support, ofthe adj ustable spring-h eld knee 0, having a catch 0 substantially asset forth.

6. In a saw-sharpening machine, the combination, with the saw-support,of the adj ustable knee 0, the spring secured to one end thereof, thebearer 0 secured to said knee, and the catch 0 connected to said bearer,substantially as set forth.

7. In a saw-sharpening machine, the combination, with the saw-support,of the adjustable knee 0, the spring secured thereto, the bearer 0 thecatch 0 connected to said bearer, the set-screw 0, and the dependingadjustable fence d substantially as set forth.

8. In a saw-sharpening machine, the combination, with the saw-support,of the bar r and the clamps *0 c secured to the ends thereof,substantially as set forth.

9. In a saw-sharpening machine, the frame it, having a hinged frontportion, and a setscrew it, for adjusting the height of the sawblade,substantially as set forth.

In testimony whereof we aiiix our signatures in presence of twowitnesses.

JACOB KNEOHT. HEINRICH KNEOH'I Witnesses:

H. LABHART, PAULINA GRACHY.

